Nikon Z fc N2016 Reference Manual page 114

Focus indicator
(steady)
(steady)
(flashes)
･ When using manual focus with subjects not suited to autofocus, note
that the in-focus indicator ( I ) may be displayed when the subject is
not in focus. Zoom in on the view through the lens and check focus.
Use of a tripod is recommended when the camera is having trouble
focusing.
Lenses with focus-mode selection
D
Manual focus mode can be chosen using focus-mode selection controls on
the lens (where available).
The focal plane mark and flange-back distance
D
Focus distance is measured from the focal plane mark ( E ) on the camera
body, which shows the position of the focal plane inside the camera (q). Use
this mark when measuring the distance to your subject for manual focus or
macro photography. The distance between the focal plane and the lens
mounting flange is known as the "flange-back distance" (w). On this camera,
the flange-back distance is 16 mm (0.63 in.).
Focus
The focus point is in front of the subject.
The focus point is behind the subject.
The camera is unable to focus.
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Description